Rubber roll



0d. 31, 1939. REE R 2,178,421

RUBBER ROLL Filed Sept. 50, 1936 1N VEN TOR ABRAHAM L. FREEDLANDER ATTORNE Y8 It is a further object to provide a roller that sired. Theuniformity of the texture of the rub- 6 I of the roller. oils, greases,etc.

Patented Oct. 31, 1939 v 2,178,421

UNITED STATES PATENT OFFICE RUBBER ROLL Abraham L. Freedlander, Dayton,Ohio, assignor to The Dayton Rubber Manufacturing Company, Dayton, Ohio,a corporation of Ohio Application September 30, 1936, Serial No. 103,417'1 Claims. (01. 91-673) My invention relates to printers rollers.against swelling and deterioration. It also pro- It is the object of myinvention to provide a vides a relatively hard impression roller withprinters roller particularly adaptable as a hard sufficient body andhardness to be satisfactory impression roller. for various purposeswhere hard rollers are dehas the property of not absorbing the inkmateber, by reason of the uniformity of disposition of rials nor theclean-up materials for cleaning off the fibers, makes it possible toproduce a superior, the ink, and has the property of protecting theuniform printing result, and to provide aroller rubber againstdeterioration and swelling, even of relatively long life, despite thefact that it is 10 though the roller is made of rubber that is normadeof rubber. 10 mally sensitive to such materials. However, when it isdesired to have an ex- It is an object to provide a printing medium oftremely hard impression roller or one that is resilient material havingfibers mixed therein extremely resistant to inks and the like, I thenwhich resist impressions made by the type and provide a sleeve ofresilient material that is inert which resist deformation of the mediumso as to to ink-cleaning materials, inks, greases and the provide asharp line contact between the medium like. This sleeve is designated 6.The roller is and the type or printed surface without deiornotvulcanized until the sleeve is applied, and

mation. then the entire structure is vulcanized at one Referring to thedrawing: time. U Figure 1 is a perspective showing the succes- The outersleeve may be made of such mate- I sive treatments and layers ofmaterial to form rials as Duprene, "'I'hiokol, or other synthetic thecompleted roller. The dimensions are necesrubbers or resins having theproperty of a sarily exaggerated in order to diagrammatically smooth,hard surface that is capable of acquiring illustrate the relationship ofthe several parts a. tack, and the further property of being inert toFigure 2 is a section taken transversely through In order to control thehardness of this thin the roller. sleeve 6, I add clays, whitings, andthe like, or

Figure 3 is an enlarged diagrammatic view in equivalent mineral fillers,in order to give body elevation showing the arrangement of the fibersand hardness. The degree of hardness will dein the rubber, runninglongitudinally of the rubtermine the proportions of these mineralingreber sheet and in the direction of winding of the dients. A typicalroller which I have found to sheet. be satisfactory in practice is onehaving 80% Referring to the drawing in detail, I is a steel mineralfiller in the sleeve 6, and 20% of a synaxle having a sand-blastedsurface as at 2. A thetic rubber material.

8 rubber cement 3 is then coated upon the sand- The Shore readings varyfrom 80 to 90 degrees. blasted surface. There is then wound upon thisThe sleeve should vary between these limits as to cemented surface oneor more layers of rubber its hardness according to the uses to which ithaving a plurality of longitudinally-disposed is to be put. fibers, allrunning in the same direction and When the vulcanization takes place, itis pref- O lying horizontally in the direction of the winding erably bythe hot water process. A typical hot 40 of the sheet. This rubber isdesignated 4, and water cure is the immersion of the roller in hot thefibers are designated 5. If the roller is to be water under pressure,with the temperature of completed at this point, then it is vulcanizedby t e w e from 250 to 260 de rees and the pres any one of the usualprocesses for this purpose. sure from 150 to 200 pounds. The approximate0 While 'rubber normally is sensitive to oils, period of time for aroller to be kept in the greases, inks and clean-up materials forcleaning water varies hours. ink from printing surfaces, yet I havefound It will be further understood that the same that the life ofrubber under such circumstances Pri p embodied in h invention m y be vissuficient to give a satisfactory performance carried-out by in'ibeddingthe fibers 5 in the for a printing roller, if there is incorporated inmanner described in the sleeve 6, thereby taking 50 the rubber a largeproportion of horizontally-disthe place of the mineral fillers. posedfibers in the rubber. In the trade this It will be understood that Idesire to comprematerial is referred to as stifiex. I have dishendwithin my invention such modifications as covered it has the property ofnot absorbing the may be necessary to adapt it to varying condill inkmaterials and of protecting the rubber tions and uses.

Having thus fully described my invention, what I claim as new and desireto secure by Letters Patent, is:

1. A new article of manufacture for use as a 5 printing rollercomprising a rigid axle and a vulcanized body of rubber mounted thereonand fixed thereto having a plurality of longitudinally disposed textilefibers therein arranged in parallelism running in the same directioncircumferentially of the roller, said fibers being uniformly distributedthroughout the body of the rubber to provide a printing roller whichresists deformation by the type and produces a sharp line contactbetween the medium and the type.

2. A new article of manufacture for use as a printing roller comprisinga metal axle, a wound rubber body mounted thereon and adherent theretohaving a plurality of unspun fibers lying therein horizontally and.parallel to the direction of winding of the rubber body on the axle,said fibers being uniformly distributed throughout the rubber body, anda sleeve of resilient material vulcanized thereover, said sleeve beinginert to oils, greases, and ink-cleaning materials.

3. A new article of manufacture for use as a printing roller comprisinga metal axle, a rubber body mounted thereon having incorporated thereina plurality of fibers lying horizontally in the direction of winding ofthe rubber body on the axle and a sleeve of resilient materialcomprising mineral filler and synthetic rubber vulcanized thereon, saidsleeve being inert to oils, greases and ink-cleaning materials and of ahardness ranging by a Shore reading from 80 to 90 degrees.

4. In combination, in a printing roller, a metal axle having asand-blasted surface with a rubber cement coating thereon, a wound sheetof rubber with a plurality of textile fibers arranged horia zontallytherein in the direction of winding of the sheet, and a relatively thinsleeve covering the rubber body, said sleeve being composed of moldablematerial comprising synthetic rubber which is inert to oils, greases andink-cleaning materials.

5. In combination, a metal axle having a sandblasted surface with arubber thereon, a wound sheet of rubber with embedded unspun textilefibers horizontally disposed in the direction of winding, and arelatively thin sleeve covering the rubber body, said sleeve beingcomposed of synthetic rubber resinous and filler material which providesan outer covering inert to oils, greases and ink-cleaning materials andhaving a substantial amount of mineral filler to pro duce a hardimpression roller of a Shore reading of from to degrees.

6. In a printing roller, the combination of relatively soft resilientrubber covering wound upon an axle, the surface of which has beenroughened, said wound rubber covering having a plurality oflongitudinally disposed textile fibers distributed horizontally in saidrubber body and arranged in the direction of the winding of said rubbercovering, and a sleeve of resilient synthetic rubber applied thereover,said sleeve consisting of approximately 80 per cent mineral filler and20 per cent synthetic rubber by weight.

7. In a printing roller, the combination of a metal axle having aroughened surface, a relatively soft resilient rubber sheet wound uponsaid axle and cemented thereto, said wound rubber sheet having aplurality of textile fibers distributed throughout the rubber mass andarranged longitudinally in the direction of the winding of said sheet,and a sleeve of resilient synthetic resinous material disposed thereovercomprising approximately 80 per cent by weight of filler, the wholebeing vulcanized to a resilient unitary roller.

ABRAHAM L. FREEDIANDER.

